|Class|Name|Company|Residence|Term Expires Dec 31|Notes|
|---|---|---|---|---|---|
|A|Max T. Wake|Jones National Bank & Trust Co.|Seward, Nebraska|2013||
|A|Vacancy|||2014||
|A|David W. Brownback|Citizens State Bank & Trust Company|Ellsworth, Kansas|2015||
|B|Vacancy|||2013||
|B|Richard K. Ratcliffe|Ratcliffe's Inc.|Weatherford, Oklahoma|2014||
|B|John T. Stout, Jr.|Plaza Belmont Management Group LLC|Shawnee Mission, Kansas|2015||
|C|Rose Washington|OTulsa Economic Development Corporation|Tulsa, Oklahoma|2013||
|C|Barbara Mowry|GoreCreek Advisors|Greenwood Village, Colorado|2014|Chairman|
|C|Steve Maestas|NAI Maestas and Ward|Albuquerque, New Mexico|2015|Deputy Chairman|

Question: what is the total number of different classes?
Answer: 3